import java.io.*;
public class lowercase{
    public static void main (String[] args) throws IOException {
        if (args.length <1) throw new RuntimeException ("not enough arguments");
        if (args.length >1) throw new RuntimeException ("too many arguments");
        BufferedReader reader = new BufferedReader (new FileReader ( new File (args[0])));
        String line;
        while ((line = reader.readLine()) != null){
            line = line.toLowerCase();
            System.out.println(line);
        }
    }
}